Step 2: Upper Board

Step 3: Lower Board

Lower board is mainly about wiring and connecting all the components. This part requires a lot of soldering and wire management skills, so I strongly do not recommend this instructable for beginners.

Once your soldering job is done it is time to tune the trim pots. It is much easier to connect a jumper wire to the common female header and tune the synth with multimeter connected to the audio jack while connecting other end of the jumper wire to each of the female button headers.